1.命令：
例如：要查看ls命令的源代码
1) whereis ls
ls: /bin/ls /usr/share/man/man1/ls.1.gz
2) sudo dpkg -S /bin/ls
coreutils: /bin/ls
3) sudo apt-get source coreutils
2.内核
1）apt-cache search linux-source
linux-source - Linux kernel source with Ubuntu patches
linux-source-3.2.0 - Linux kernel source for version 3.2.0 with Ubuntu patches
2）sudo apt-get source linux-source-3.2.0
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